.banner_bg{
    width: 100%;
    height: 300px;
    background-image: url(../images/about.jpg);
}

.main{
    width: 1180px;
    height: 248px;
    padding-top: 80px;
}
.main .main_h{
    width: 980px;
    height: 40px;
    margin-left: 100px;
}
.main .main_h span{
    width: 120px;
    height: 40px;
    color: #3083EB;
    font-size: 30px;

    line-height: 40px;
}
.main .main_m{
    width: 980px;
    height: 148px;
    color: rgb(75,75,75);
    margin-top: 30px;
    margin-left: 100px;
    line-height: 30px;
    font-size: 18px;
}
.map {
    margin-top:30px;
    width: 1180px;
    height: 654px;
}
#btnTop {
    display: none;
    position: fixed;
    bottom: 20px;
    right: 30px;
    z-index: 99;
    border: none;
    outline: none;
    background-color: #89cff0;
    color: white;
    cursor: pointer;
    padding: 15px;
    border-radius: 10px;
  }
  #btnTop:hover {
    background-color: #1E90FF;
  }